Backpressure and power matching hydraulic hybrid power control double-actuator system

Abstract

Disclosed is a backpressure and power matching hydraulic hybrid power control double-actuator system. By additionally arranging a power control unit, a backpressure control unit, a controller, a switching control valve, a hydraulic control one-way valve and a pressure sensor, oil return cavity pressure of each actuator except a maximum load actuator is controlled; pressure of an oil inlet cavity of each actuator is the same with differential pressure of a control valve opening, and the fact that pressure flow of a hydraulic pump is matched with that of each hydraulic actuator is achieved; meanwhile, the hydraulic hybrid power function is further extended to the dynamic potential energy recycle, and throttling loss of a multi-actuator system caused by load difference is further eliminated; and the energy-saving effect is greatly improved, the investment recovery cycle is shortened, and application and promotion are facilitated.

Description

technical field [0001] The invention relates to a multi-actuator control system in hydraulic control technology, in particular to an electro-hydraulic control technology used for power matching of engineering equipment and reducing pressure loss of a multi-actuator system. Background technique [0002] At present, various types of non-road mobile equipment such as construction machinery, road construction machinery, mining machinery, forestry machinery, and agricultural machinery generally use internal combustion engines to drive hydraulic pumps as power sources, distribute and transmit power through multi-way valves and pipelines, and control The hydraulic system with compound actions of multiple actuators is also the most widely used and most important field of hydraulic technology. It is characterized by high power density, compact structure, good maneuverability and strong environmental adaptability, but the fatal disadvantage is low energy utilization. The energy effici...

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Problems solved by technology

In the published invention patent "Energy-saving shield segment assembly and positioning electro-hydraulic control system using load-sensing technology, CN103032396A", the multi-actuator system often has the characteristics of a wide range of load changes. By adopting the load-sensing control principle, the The output pressure of the hydraulic pump always changes with the change of the load, avoiding the energy waste caused by the original system always supplying oil at the highest working pressure, and reducing the throttling loss and overflow loss, but because the output pressure of the pump can only match the highest For multi-actuator systems, the throttling loss of low-load actuator control valves caused by large load differences can never be eliminated, and this part of the loss is precisely the most important source of energy consumption for multi-actuator systems, accounting for 35%~39% of engine output power

[0003] In addition, the load of construction machinery varies in a large range during actual operation, causing the power source to often operate in a low-efficiency working area, which increases the emission and energy consumption of the power source. Therefore, it is necessary to use torque coupling to add Other forms of power sources are used to match the original power sources, such as electric / generators of hybrid electric power or hydraulic pumps / motors of hydraulic hybrid power. The power of the power source, thereby improving the energy efficiency of the main power source, and under heavy load conditions, the auxiliary power source releases the absorbed energy and assists the main power source to drive the load to do work together. However, in the existing hybrid power mode, the auxiliary power source provides The energy will be lost through the secondary throttling of the control valve, and the function is only to match the working point of the engine. After adding this unit, the cost of the whole machine will increase a lot, and the cost recovery period is longer, which restricts the popularization and application

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